Process for preserving wood



i Patented Mar. 9, 1926.

UNITED STATES PATENT orrics.

HANS NEUBAUER, OF KAMENNE ZEHROVIGE, NEAR KLADNO, GZEOHOSLOVLKIL' PROCESS FOR PRESERVING WOOD.

No Drawing.

To all whom it may concern:

. Be it known that I, HANS NEUBAUER, of 'Kamenne Zehrovice, near Kladno, Czechoslovakia, having invented certain new and useful Improvements in a Process for Preservin Wood, do hereby declare vthat the following is a full, clear, and exact description of the same.

It is known to use concrete or cement in order to preserve Wood, the cementitious,

ll'ltttGIltll being employed either alone or in conjunction with coal tar, asphalt or the like. In these known processes the preserving material is applied-in a thick layer on the surface of the wood and forms a strong, rigid protecting covering. These processes are inconvenient and expensive and do not sufficiently protect the Wood against fungoid growths.

According to the present invention, a considerably cheaper and better preservation is obtained by coating the wood with a thin air-tight la er of concrete or cement,or similar har ening substances (for example, plaster, different kinds of mortar, etc.) in

which the hardenin substances are added to an aqueous sterillzing solution. As the sterilizing agent can be employed rock salt. sulphate of. copper or iron, salts of zinc or mercury or othersimilar substances which I Application filed'eptember 17, 1925. Serial m. 07,020. i

prevent the wood from rotting. Coal tar or its derivatives are, however, excluded be cause the cement does not combine with these materials and consequently does not form adherent coatings. The process is particnlarly suitable forthe protection of mine timbers. The protecting coating can be applied in difi'erent ways; for example, the wood, before being assembled to form the timber framing, can be dipped in the pre- 40 pared concrete, or the concrete can be sprinkled or sprayed on the previously constructed timber framing.

What I do claim and desire to secure by Letters-Patent, is

1. A process of preserving wood, comprising the steps of intimately mixing together cementitious material and an aqueous sterilizing solution, and applying the resultant product to the surface of the wood to form a thin, air-tight protective layer thereon.

2. A process of-preserving wood, comprising the steps of intimatel mixing together cementitious material an an a ueous solution of rock salt, and applying t one resultant product to the surface of the wood to form a thin, air-tight protective layer thereon.

In testimony whereof I have signed my name to this specification.

HANS NEUBAUER. 

